CN105060623B - Double dirt method for treating water based on hydrogenesis and acetogenesis/hydrogen autotrophic denitrification coupling - Google Patents

Double dirt method for treating water based on hydrogenesis and acetogenesis/hydrogen autotrophic denitrification coupling Download PDF

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CN105060623B
CN105060623B CN201510449843.4A CN201510449843A CN105060623B CN 105060623 B CN105060623 B CN 105060623B CN 201510449843 A CN201510449843 A CN 201510449843A CN 105060623 B CN105060623 B CN 105060623B
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pond
acetogenesis
hydrogenesis
sludge
autotrophic denitrification
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CN105060623A (en
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王晓玲
高尚
宋铁红
李静文
殷宝勇
李紫棋
余勇
韩东旭
张晓旭
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Jilin Jianzhu University
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Jilin Jianzhu University
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Abstract

Based on the method for double dirt water carbon elimination denitrification dephosphorization technique Treating Municipal Sewages of hydrogenesis and acetogenesis/hydrogen autotrophic denitrification bacterium coupling mechanism, it is related to a kind of minimizing technology of the polluter such as nitrogen, phosphorus in sewage of carbon source shortage.The present invention solves the problems, such as that easily collecting, digestive efficiency be not poor as gas during pretreating process using anaerobic digestion, while providing high-quality carbon source acetic acid for follow-up denitrification dephosphorization technique.Mainly comprise the following steps:Sewage Jing after setting pot process enters hydrogenesis and acetogenesis/denitrification coupled reaction pond, while Process for Effluent is back to the pond;Solid-liquid separation is carried out into first stage precipitation tank after reaction, thickened sludge is back to coupled reaction pond;First stage precipitation tank supernatant water enters follow-up anaerobic/anoxic/aerobic activated sludge reaction tank, synchronously completes the removal of nitrogen and phosphorus;Reacted mixed liquor carries out solid-liquid separation into second-level settling pond, and to process water, thickened sludge is back to anaerobic/anoxic/aerobic activated sludge reaction tank to supernatant water.

Description

Double dirt method for treating water based on hydrogenesis and acetogenesis/hydrogen autotrophic denitrification coupling
Technical field
The present invention relates to a kind of method of wastewater treatment, and in particular to the polluter such as nitrogen, phosphorus in the sewage of carbon source shortage Minimizing technology.
Background technology
20 century 70s, global energy crisis outburst, Anaerobic Microbiological Treatment Technology is due to low energy consumption, taking up an area The advantage such as area is little and be used widely.In May, 1997, in the 8th international anaerobic digestion seminar that Japanese celestial platform is held On, the acquired achievement in research in terms of Treating Municipal Sewage of Anaerobic Microbiological Treatment Technology is noticeable.Professor Lettinga is broken Speech:If there is suitable post-processing approach, Anaerobic Microbiological Treatment Technology can become the effective means of dispersion type domestic wastewater process.With The increasingly extensive application of Anaerobic Microbiological Treatment Technology, researcher is by the post processing aerobic reactor water outlet containing nitrate nitrogen The anaerobic reactor of front end is directly back to, anaerobic methane production and denitrifying coupling is realized, has been reached while carbon elimination denitrogenation Purpose.But because the municipal sewage water yield is big, pollutant concentration is low, water temperature is low, coupled with denitrification using anaerobic methane production Process removes carbon and nitrogen, the methane of generation not easily collecting and anaerobic digestion efficiency is poor, and this will cause Anaerobic Methods in Treating in city Popularization degree in city's sewage disposal is not enough.
Substantial amounts of experimental study and engineering practice show, acetic acid is the excellent of most of microorganism in biological treatment of waste water system Matter carbon source, if anaerobic reactor acetic acid producing rate can be improved, reduced both can the consumption of anaerobism section carbon source, improve low carbon-nitrogen ratio sewage De- list treatment effect, can reduce methane emission again, reduce greenhouse effect.
Anaerobic digestion process is divided into 3 stages under normal circumstances, and hydrogenesis and acetogenesis process therein is by acidogenic fermentation rank Organic acid more than two carbon of section(Except acetic acid)Acetic acid, H are converted into alcohol2、CO2Deng, and produce the process of new cellular material. The antibacterial for participating in hydrogenesis and acetogenesis process is hydrogen producing acetogenic bacteria(H2-producing acetogens, HPA).In mark Under the conditions of standard, the reaction of hydrogen producing acetogenic bacteria degraded short-chain fatty acid spontaneous can not be carried out(ΔGo>0).Therefore, it is to improve second Sour yield, it is necessary to using a kind of thermodynamically incidental reaction come " pulling " non-incident hydrogenesis and acetogenesis in theory Process.
The content of the invention
The invention aims to reduce the energy consumption of wastewater treatment, improve the utilization of carbon source rate of low carbon-nitrogen ratio sewage, and A kind of double dirt water carbon elimination denitrification dephosphorization technique methods based on hydrogenesis and acetogenesis/hydrogen autotrophic denitrification coupling mechanism of exploitation.
The method that the carbon nitrogen phosphorus of low ratio of carbon to ammonium municipal sewage is removed simultaneously is realized according to the following steps:1. from municipal drain The waste water of net enters hydrogenesis and acetogenesis/denitrification coupled reaction pond Jing after setting pot process, while second-level settling pond water outlet and one Level sedimentation tank thickened sludge is back to the pond respectively, and reflux ratio is 1;The hydraulic detention time in the pond is 4 ~ 6h, using waterpower Method controls sludge age for 15 ~ 20d;2. coupled reaction pond water outlet carries out solid-liquid separation, one-level precipitation into first stage precipitation tank The sedimentation time in pond is 2 ~ 3h;3. first stage precipitation tank supernatant water enters follow-up anaerobic/anoxic/aerobic activated sludge reaction tank, together When second-level settling pond thickened sludge be back to the anaerobism section in the pond, reflux ratio is 0.5 ~ 1, and the total hrt in the pond is 8 ~ 10h, nitrification liquid nitrate recirculation ratio are 1 ~ 3, adopt hydraulic method to control sludge age for 10 ~ 12d;4. anaerobic/anoxic/aerobic work Property the water outlet of sludge reaction pond carry out solid-liquid separation into second-level settling pond, the sedimentation time is 3 ~ 4h, and supernatant water discharge completes sewage Processing procedure.
Inventive principle and advantage
In normal conditions, the reaction of hydrogen-producing acetogens degraded short-chain fatty acid spontaneous can not be carried out mostly, such as be degraded The Δ G of ethanol0For+9.6kJ/mol, the Δ G of degraded butanoic acid0For+48.1kJ/mol, the Δ G of degraded propanoic acid0For+76.1kJ/ Mol, therefore just need to can complete metabolic process with hydrogen-consuming bacteria syntrophism symbiosis (such as consumption producing hydrogen and methane bacterium), i.e., only as H in system2Pressure When power is sufficiently low, such as the pressure of hydrogen is 10-6During individual atmospheric pressure, the Gibbs free energy of hydrogenesis and acetogenesis course of reaction will change Become.And hydrogen autotrophic denitrification bacterium denitrification process Δ G0For -224kJ/mol.According to the standard Gibbs free energy of course of reaction Understand, the denitrification process of hydrogen autotrophic denitrification bacterium " can pull " hydrogenesis and acetogenesis process, and two kinds of floras can syntrophism growth.Cause This, the waste water in anaerobic acid-production reaction tank after backflow nitrification can form the body of hydrogenesis and acetogenesis and the collaboration of hydrogen autotrophic denitrification System, during realizing while denitrogenation except carbon, and improve acetic acid producing rate, take full advantage of limited in municipal wastewater Carbon source.
Description of the drawings
Fig. 1 is the double dirt mud carbon elimination denitrification dephosphorization technique streams based on hydrogenesis and acetogenesis/hydrogen autotrophic denitrification coupling mechanism Journey schematic diagram.1 is water inlet, and 2 is hydrogenesis and acetogenesis/hydrogen autotrophic denitrification coupled reaction pond, and 3 is first stage precipitation tank, and 4 is anaerobism Pond, 5 is anoxic pond, and 6 is Aerobic Pond, and 7 is second-level settling pond, and 8 is coupled reactor sludge reflux, and 9 is that synchronous denitrification dephosphorizing is anti- Pond sludge reflux is answered, 10 is effluent recycling, and 11 flow back for Aerobic Pond nitrification liquid, 12 is water outlet, and 13 is that coupled reaction pond is remaining dirty Mud, 14 is synchronous denitrification dephosphorizing reaction tank excess sludge.
Specific embodiment
Specific embodiment one:Present embodiment is the double mud based on hydrogenesis and acetogenesis/hydrogen autotrophic denitrification coupling mechanism Sewage carbon elimination denitrification dephosphorization technique method, is specifically completed according to the following steps:1. from the waste water Jing setting pots of municipal drainage pipe network Hydrogenesis and acetogenesis/denitrification coupled reaction pond is entered after process, while second-level settling pond water outlet and first stage precipitation tank thickened sludge The pond is back to respectively, and reflux ratio is 0.5 ~ 1.5;The hydraulic detention time in the pond is 4 ~ 6h, using hydraulic method control Sludge age is 15 ~ 20d;2. coupled reaction pond water outlet carries out solid-liquid separation into first stage precipitation tank, during the precipitation of first stage precipitation tank Between be 2 ~ 3h;3. first stage precipitation tank supernatant water enters follow-up anaerobic/anoxic/aerobic activated sludge reaction tank, while two-stage precipitation The thickened sludge in pond is back to the anaerobism section in the pond, and reflux ratio is 0.5 ~ 1, and the total hrt in the pond is 8 ~ 10h, is nitrified Liquid nitrate recirculation ratio is 1 ~ 3, adopts hydraulic method to control sludge age for 10 ~ 12d;4. anaerobic/anoxic/aerobic activated sludge reaction Pond water outlet carries out solid-liquid separation into second-level settling pond, and the sedimentation time is 3 ~ 4h, and supernatant water discharge completes sewage disposal process.
Specific embodiment two:The difference of present embodiment and specific embodiment one be step 1. in product hydrogen produce second Acid/denitrification coupled reaction tank waterpower time of staying is 5h, and other are identical with specific embodiment one.
Specific embodiment three:The difference of present embodiment and specific embodiment one or two be step 1. in product hydrogen Product acetic acid/denitrification coupled reaction pond sludge age is 18d, and other are identical with specific embodiment one or two.
Specific embodiment four:Difference of the present embodiment from specific embodiment one to three is step 1. sludge reflux Than for 1, other are identical with specific embodiment one to three.
Specific embodiment five:The difference of present embodiment and specific embodiment one to four be step 1. in two grades sink Shallow lake pond supernatant reflux ratio is 1, and other are identical with specific embodiment one to four.
Specific embodiment six:Difference of the present embodiment from specific embodiment one to five is that step 2. sink by middle one-level The sedimentation time in shallow lake pond is 2.5h, and other are identical with specific embodiment one to five.

Claims (6)

1. a kind of double sludge carbon elimination denitrification dephosphorization techniques based on hydrogenesis and acetogenesis/hydrogen autotrophic denitrification coupling mechanism process city The method of sewage, it is characterised in that methods described comprises the steps:1. at the waste water Jing setting pots of municipal drainage pipe network Hydrogenesis and acetogenesis/hydrogen autotrophic denitrification coupled reaction pond is entered after reason, while second-level settling pond water outlet and first stage precipitation tank concentration Sludge is back to the pond respectively, and reflux ratio is 0.5 ~ 1.5;The hydraulic detention time in the pond is 4 ~ 6h, using hydraulic method Sludge age is controlled for 15 ~ 20d;2. hydrogenesis and acetogenesis/hydrogen autotrophic denitrification coupled reaction pond water outlet is carried out into first stage precipitation tank Solid-liquid separation, the sedimentation time of first stage precipitation tank is 2 ~ 3h;3. first stage precipitation tank supernatant water enters follow-up anaerobic/anoxic/aerobic Activated sludge reaction pond, while the thickened sludge of second-level settling pond is back to the anaerobism section in the pond, reflux ratio is 0.5 ~ 1, the pond Total hrt be 8 ~ 10h, the pond aerobic section nitrification liquid is back to the anoxia section in the pond, nitrification liquid nitrate recirculation ratio is 1 ~ 3, adopt hydraulic method to control sludge age for 10 ~ 12d;4. anaerobic/anoxic/aerobic activated sludge reaction tank water outlet enters two grades Sedimentation tank carries out solid-liquid separation, and the sedimentation time is 3 ~ 4h, and supernatant water discharge completes sewage disposal process.
2. the double sludge carbon elimination denitrogenations based on hydrogenesis and acetogenesis/hydrogen autotrophic denitrification coupling mechanism according to claim 1 The method of dephosphorization process Treating Municipal Sewage, it is characterised in that:Step 1. in the coupling of hydrogenesis and acetogenesis/hydrogen autotrophic denitrification it is anti- The tank waterpower time of staying is answered to be 5h.
3. the double sludge carbon elimination denitrogenations based on hydrogenesis and acetogenesis/hydrogen autotrophic denitrification coupling mechanism according to claim 1 The method of dephosphorization process Treating Municipal Sewage, it is characterised in that:Step 1. in the coupling of hydrogenesis and acetogenesis/hydrogen autotrophic denitrification it is anti- Pond sludge age is answered to be 18d.
4. the double sludge carbon elimination denitrogenations based on hydrogenesis and acetogenesis/hydrogen autotrophic denitrification coupling mechanism according to claim 1 The method of dephosphorization process Treating Municipal Sewage, it is characterised in that:1. return sludge ratio is 1 to step.
5. the double sludge carbon elimination denitrogenations based on hydrogenesis and acetogenesis/hydrogen autotrophic denitrification coupling mechanism according to claim 1 The method of dephosphorization process Treating Municipal Sewage, it is characterised in that:1. middle second-level settling pond supernatant reflux ratio is 1 to step.
6. the double sludge carbon elimination denitrogenations based on hydrogenesis and acetogenesis/hydrogen autotrophic denitrification coupling mechanism according to claim 1 The method of dephosphorization process Treating Municipal Sewage, it is characterised in that:Step 2. middle first stage precipitation tank sedimentation time be 2.5h.
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